Determining surface area of sun?

I think the question is asking you determine the area illuminated by the sun at a distance equivalent to the orbit of the earth. The 'shade' is a sphere with a radius equal to the distance between the sun and the earth. The distance between the sun and the earth is 1 astronomical unit (AU) or 149,600,000 km (98 million miles) - plug the numbers into the formula for the surface area of a sphere to answer the question. 4*pi*149,600,000^2.